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YES a noticeable difference. In fact, I am at my office now and on the way over broke my range record for a single tank. I'll fill up on the way home but I expect this will be one of my best tanks yet. If that's any indication of MPG, I'm REALLY happy because this mod wasn't even on for the whole tank.
Yes road noise has decreased. With all the mods this car really is extremely quiet now.
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